加密解密(源自Discuz!NT3.1)

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AES加密解密
   
    
    
    
    
/// <summary>
/// AES加密解密
/// </summary>
public class AES
{
// 默认密钥向量
private static byte [] Keys = { 0x41 , 0x72 , 0x65 , 0x79 , 0x6F , 0x75 , 0x6D , 0x79 , 0x53 , 0x6E , 0x6F , 0x77 , 0x6D , 0x61 , 0x6E , 0x3F };

public static string Encode( string encryptString, string encryptKey)
{
encryptKey
= Utils.GetSubString(encryptKey, 32 , "" );
encryptKey
= encryptKey.PadRight( 32 , ' ' );

RijndaelManaged rijndaelProvider
= new RijndaelManaged();
rijndaelProvider.Key
= Encoding.UTF8.GetBytes(encryptKey.Substring( 0 , 32 ));
rijndaelProvider.IV
= Keys;
ICryptoTransform rijndaelEncrypt
= rijndaelProvider.CreateEncryptor();

byte [] inputData = Encoding.UTF8.GetBytes(encryptString);
byte [] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0 ,inputData.Length);

return Convert.ToBase64String(encryptedData);
}

public static string Decode( string decryptString, string decryptKey)
{
try
{
decryptKey
= Utils.GetSubString(decryptKey, 32 , "" );
decryptKey
= decryptKey.PadRight( 32 , ' ' );

RijndaelManaged rijndaelProvider
= new RijndaelManaged();
rijndaelProvider.Key
= Encoding.UTF8.GetBytes(decryptKey);
rijndaelProvider.IV
= Keys;
ICryptoTransform rijndaelDecrypt
= rijndaelProvider.CreateDecryptor();

byte [] inputData = Convert.FromBase64String(decryptString);
byte [] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0 ,inputData.Length);

return Encoding.UTF8.GetString(decryptedData);
}
catch
{
return "" ;
}

}

}

 

 

DES加密解密
   
    
    
    
    
/// <summary>
/// DES加密解密
/// </summary>
public class DES
{
// 默认密钥向量
private static byte [] Keys = { 0x12 , 0x34 , 0x56 , 0x78 , 0x90 , 0xAB , 0xCD , 0xEF };

/// <summary>
/// DES加密字符串
/// </summary>
/// <param name="encryptString"> 待加密的字符串 </param>
/// <param name="encryptKey"> 加密密钥,要求为8位 </param>
/// <returns> 加密成功返回加密后的字符串,失败返回源串 </returns>
public static string Encode( string encryptString, string encryptKey)
{
encryptKey
= encryptKey.Substring( 0 , 8 ); encryptKey = encryptKey.PadRight( 8 , ' ' );
byte [] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring( 0 , 8 ));
byte [] rgbIV = Keys;
byte [] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP
= new DESCryptoServiceProvider();
MemoryStream mStream
= new MemoryStream();
CryptoStream cStream
= new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray,
0 , inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());

}

/// <summary>
/// DES解密字符串
/// </summary>
/// <param name="decryptString"> 待解密的字符串 </param>
/// <param name="decryptKey"> 解密密钥,要求为8位,和加密密钥相同 </param>
/// <returns> 解密成功返回解密后的字符串,失败返源串 </returns>
public static string Decode( string decryptString, string decryptKey)
{
try
{
decryptKey
= decryptKey.Substring( 0 , 8 );
decryptKey
= decryptKey.PadRight( 8 , ' ' );
byte [] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte [] rgbIV = Keys;
byte [] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP
= new DESCryptoServiceProvider();

MemoryStream mStream
= new MemoryStream();
CryptoStream cStream
= new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray,
0 , inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return "" ;
}
}
}

 

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